Aquarium floor



FIG. 1 is a front elevational view of an aquarium floor showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken line representation of indicia in FIGS. 1-4 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for an aquarium floor, as shown and described. 